Mechanical movement.



R. B. PRENTICE. MECHANICAL MOVEMENT.-

APPLICATION FlLED FEB- 8. 19H.

,Afifi lcfa tented Apr. 23,1918.

INVENTOR WITNESSES BYv ATTORNEY nnur srnns ran on RUDOLPH PREN'I'ICE, 0FFALL RIVER, MASSACHUSETTS.

MECHANICAL MOVEMENT.

Specification of Letters Patent.

Patented am. as, rare.

Application filed. February 8, 1917. Serial No. 147,431.

T) all whom it may concern): 1

Be it known that l[, RUDOLPH B. Pannrion, a citizen of .the UnitedStates, residing at Fall River, in the county of Bristol and StateofMassachusetts, have invented oer to provide simple and efficient meanswhere by reciprocatory motion may be transformed into rotary motion orrotary motion may be transformed into reciprocatory motion. A furtherobject is to provide a rotatable disk or the equivalent in combinationwith a system of levers and links so connected to the disk as to impartrotary motion thereto whenpower is applied to this system, or to impartreciprocatory motion to a member connected to thissystem when power isap plied to the disk so as to cause rotation thereof. A further object,is to provide a movement which is well adapted for use as an escapementfor chronometers. A further object is to provide a movement which may beactuated by power applied thereto so as to cause uniform rotation of thedisk. Further objects will appear from the detail description.

The single figure of the drawings is a front view of a movementconstructed in accordance with my invention as applied to a chronometerescapement disk.

' A shaft 1 is rotatably mounted in a hanger 2, a disk 3" being keyed onthis shaft. Disk 3. is provided with an eccentric pin 4, A link 5 ispivotally secured atits upper end to pin d and at its lower end to anarm 6 which is pivotally secured at its upper end to a fixed pin 7 foroscillation about a fixedv axis. The lower end of link 5 is pivotallysecured to the lower end of arm 6, as at 8. A link 9 is pivotallysecured at its inner end to the eccentric pin 4 and at its outer end tothe inner end of a lever 10, as at 11. Lever 10 is pivotally mounted atits longitu dinal center on a fixed pin 12 for movement a rod 13, as at141-. The lower end of rod 13 is pivotally connected to the lower end ofa rod 15, as at 16, the upper end of which is pivotally connected to thelower ends of ink 5 and arm 6. As will be noted, the links5 and 9, andthe arm 6, are all of the same length, and the fixed pins 7 and 12 arepositioned on opposite sides of the disk 3 are in alinementdiametrically of the is r. i

This movement is also well adapted for use in connection withchronometers, being especially useful as an escapement mechanism bymeans of which the usual anchor and pallet may be eliminated thus givinga noiseless escapement. In the drawings I have shown my movement asapplied to a rotatable disk 3" which may be considered as the escapementwheel of a chronometer. The outer end of this link is pivotally securedby a pin 23 to the upper end of a counter-weight rod 24 which is pivotedadjacent its lower end on a fixed pin 25 for oscillation about the same.A counterweightf26 is secured on the lower end of this lever and servesto counterbalance a pendulum 27 the upper end of the stem of which ispivotally secured on the pin 23,

the usual pendulum bob or weight 28 being secured on this stem. In usingmy move ment as an escapement mechanism, the disk 3 is rotated in thedirection indicated. As the disk is rotated, theeccentric pin t israised. When this pin is raised the link 5 is subjected to tension, thustending to fold the toggle arm composed of rod 15 and arm 6 inward so asto shorten the same and move link 5 and arm 6 into longitudinalalinement. When rod 15 is raised rod 13 will be moved toward the rightas considered from the figure of the drawings so as to depress the outerend of lever 10 and raise the outer end of link 9. This movement of therod 13 subjects the link 9 to tension, the

combined'pressure on link 9 and tension on link 5 serving to move therods 13 and 15,

and the members connected thereto, into the positions indicated by thedot and dash lines. This movement of these members is opposed by thependulum 27, and is assisted by the counter-weight 26, until thecounterweight rod 2 1 has been moved past the verits extreme position B,this movement being opposed by the counter-weight 26. The counter weightand the pendulum .thus act in opposition to insure smooth operatlon ofthe escapement. By varying the length of the pendulum and of thecounter-weight rod 24 this opposition to the rotation of disk 3 maybeadjustedorregulated so as to give the desired speed 'of rotation to suit"the particular chronometer in connection with which this escapement isused. As the forces operating the rods 13 and 15 are exerted along linesin opposite directions these forces tend to oppose each other so as toestablish a more or less equalization of forces thus insuring smooth anduniform rotation of the escapement disk S I When the pendulum has beenmoved into its extreme position in either direction the rotation of disk3 will be momentarily checked "thus giving an intermittent escapementasi'n the standard clock or chronometer; In the drawings the pendulum isshown in its extreme position toward the left, as considered from thedrawings.

, VVhen the pendulum is in this position, the i links 9 and 10 are ondead center and further rotation of the disk is prevented until thependulum 27 has reached its extreme position toward the left, the forceof the pendulum when swinging in this, direction tending to raise therod 13 so as to cause the line of tension exerted on link 9 to passbelow the axis of the disk and reverse the direction'ofrotation thisforce exerted by the rod 13 being counteracted by a force acting in anopposite direction longitudinally of link5 tending to cause rotation ofthe disk in its original direction of rotation due to the straighteningof the, toggle arm composed of the arm 5 and link 6, and the forwardmovement of this toggle arm with the pendulum/ By this means, when thependulum isswung into its extreme position toward the left the rotationof disk 3 is momentarily checked, the, disk being locked againstrotationuntil the pendulum starts on its movement toward the right so as topermit reverse movement of the rods 13 and 1 5, and the various elementsconnected thereto, thus again rotating the disk until the links 5 and 6have been brought into alinement so as to be on dead center thus againchecking the rotation of disk 8, as indicated in the drawings. Thimovement of the operating links and rods insures a uniform rotation ofthe escapement disk 3, the disk being checked momentarily after eachhalf rotation thus giving an escapement well adapted for use inchronometers. This operation of the disk is smooth and accurate, thedisk being moved through an arc of 180 in uniform time, and thisoperation of the disk being independent of, and not in any wayinfluenced by, the spring motor or other means employed for rotating thedisk.

* By means of the differential pendulum which is composed of thecounter-weight 26 and rod 24:, and the pendulum 27 and 28,

the beat of a pendulum of any length may be duplicated by relativeadjustment of the counter-weight and the pendulum bob thus permittingquick and easy adjustment of the escapement to suit the particularchronometer in connection with which it is used.

What I claim is 1. In mechanical movements, a rotatable disk, aneccentric pin secured on said disk, a toggle lever pivoted at its upperend for oscillation about a fixed axis, a link pivotally secured at oneend to the pin-and at the other end to said toggle lever intermediatethe ends thereof, a lever pivotally mounted intermediate its ends formovement about a fixed axis, the pivot of said lever being positioned atthe opposite side of the axis of the disk to the pivot of the togglelever, a link pivotally secured at its inner end to said eccentric pinand at its outer end to the inner end of said lever, and means forintermittently oscillating said lever and toggle about their respectiveaxes in the same direction, the direction of movement of said lever andtoggle being alternately reversed whereby the links are urged in thesame direction and have their direction of movement alternately reversedso as to permit rotary motion of the disk.

2. In mechanical movements, a disk, an eccentric pin, a lever pivotallymounted intermediate its ends for movement about a fixed axis, an armmounted at its upper end for oscillation about a fixed axis, the axis ofsaid arm and lever being equi-distant from the disk and in alinementdiametrically of the same, a link pivotally secured at its outer end tothe inner end of the said lever and at its inner end to said eccentricpin, a link pivotally secured at its inner end to the eccentric pin andat its outer end to the lower end of said arm, the two said links, andthe arm all being of approximately the same length, a rod pivotallyscoured at its upper end to the lower end of said arm, a rod pivotallysecured at its upper end to the outer end of said lever and at its lowerend to the lower end of the rod eonnected to. the arm, a counter-weightrod mounted for oscillation about a fixed axis intermediate its ends, acounter-Weight mounted on the lower end of said rod, a connecting linkpivotally secured at one end to the upper end of the counter-Weight rodand at the other end to the lower ends of the rods connected to saidlever and arm and a pendulum pivotally secured to the upper end of saidcounter-weight rod for oscillation relative thereto.

In testimony whereof I afiix my signature in presence of two Witnesses.

RUDOLPH B. PRENTICE. Witnesses:

HENRY T. MARTIN, CHAS. G. Ronnnrs.

topics of this patent may be obtained tor five cents each, by addressingthe w lilttflomtt' ot mttntt,

Washington, D. W

